Method for the isomerisation of glucose into fructose

Abstract

The invention relates to a method for the isomerization of glucose into fructose in water in the presence of a solid base catalyst characterized by its reversibility of CO 2 adsorption at a low temperature, the catalyst being a catalyst comprising at least one supported or non-supported lanthanide oxide or a molecular sieve based on silicon containing the organic template thereof. The invention also relates to a method for preparing HMF from glucose, comprising the isomerization of glucose into fructose.

The invention claimed is: 
     
       1. A method for isomerisation of glucose into fructose comprising providing glucose in water in the presence of a solid basic catalyst, wherein the reversibility of the CO 2  adsorption isotherms at 30° C. and the differential CO 2  adsorption heat, measured at 30° C., comprises between 60 and 110 kJ·mol −1 , and wherein the catalyst is selected from the group consisting of MgLaO, LaO supported on coal, MgLaO treated with pyridine, MCM48 and MCM50. 
     
     
       2. The method according to  claim 1 , wherein the catalyst is in an amount of between 0.5 and 100% by weight, based on the weight of glucose. 
     
     
       3. The method according to  claim 1 , wherein the glucose is in an amount of between 0.5 and 15% by weight, based on the weight of water. 
     
     
       4. The method according to  claim 1 , wherein the method is applied at a temperature between 75 and 180° C. 
     
     
       5. The method according to  claim 1 , wherein the method does not comprise thermal pretreatment of the catalyst. 
     
     
       6. The method according to  claim 1 , wherein the method further comprises a preliminary step for treating the MgLaO catalyst with pyridine.